Core Structure of Vortex Line in 3He-B

Abstract

We investigate the structure of the order parameter of 3He-B when there exists a singular vortex line and show that it becomes nonunitary near the vortex core. As a consequence of the nonunitarity, a term linear in the magnetic field appears in the orientation energy of the n-vector. We numerically solve the Ginzburg-Landau equations for the order parameter and estimate this contribution to the orientation energy. Because this term is proportional to nz2 and its coefficient is positive when H// Ω, the separation of the satellite peaks in the n.m.r. decreases when the direction of the magnetic field is reversed from H// Ω to H// -Ω.